Portion of a housing for an electric toothbrush handle



FIG. 1 is a perspective view of a portion of a housing for an electric toothbrush handle as seen from the top, front and right sides, wherein the broken line disclosure is for environmental purposes only and does not form a part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image; and,

FIG. 4 is a top plan view thereof. 

The ornamental design for a portion of a housing for an electric toothbrush handle, as shown and described. 